The electrochemical properties of uranium, dissolved in LiCl-KCl eutectic melt, were investigated using cyclic voltammetry and chronopotentiometry on an inert tungsten electrode. It was found that U4+ was reduced to U0 via a two-step mechanism corresponding to U4+/U3+ and U3+/U0 transitions. At 673 to 823K, the diffusion coefficients of U3+ and U4+ were similar:

U3+:    D(cm2/s) = 1.37 x 10-3exp[-24200/RT]

U4+:     D(cm2/s) = 5.25 x 104exp[-19800/RT]

Electrochemistry of Uranium in Molten LiCl-KCl Eutectic. P.Masset, D.Bottomley, R.Konings, R.Malmbeck, A.Rodrigues, J.Serp, J.P.Glatz: Journal of the Electrochemical Society, 2005, 152[6], A1109-15